It is getting gas to the motor, but will not start. I can shoot starting fluid into the throttle bottle and it will start until it burns the fluid off. It has a new fuel filter. It's a 93 4.0 with a fresh tank of gas.

Can you hear the fuel pump working? First thing I thought of was the fuel cut off switch located at the top of the carpet in the passenger side floorboard. I had an issue like you are describing and it was caused when I vacumed the truck and hit that switch to hard and tripped it.

I pulled the fuel line off at the engine and when I turn the key on fuel shoots out across the engine compartment, so I know the fuel is getting there. What pressure should it be? I did notice that when I turn the key on it pumps fuel for the two to three second duration, but when I actually try to turn the engine over and start it I gets no fuel. Also...I don't see how it could be dirty injectors...all six at the same time? Yes I can hear the fuel pump running and it really seems something is keeping the injectors from opening up, i.e. a safety switch of some sort.

check the fuel rail if there is one. I'm not too familiar with the fuel system past the filter, but there has to be something to carry the fuel from that line to the injectors...fuel rail. Check that thing. That could cause all of them to not work. That's about all I can think of right now til I get a chance to look under my hood at what's there...hope this helps for now.

Found the inertia switch and it was not tripped. I bypassed it anyway to no avail. Don't know of any injector relay, and the only few relays I have found are indentified. I am quite sure my problem is the injectors are not opening up, but what has them locked out?

I had to finally go to the mechanic. He replaced the fuel pump and crankshaft position switch(which tells the injectors when to open). A week later she quit me at the intersection again. I take her back to the mechanic and he is pulling his hair out. Everything is normal except there is no power to the fuel pump itself, and he can't figure out why. As I get frustrated I go visit him while 3 guys are working on it and still nothing. On guy has a continuity tester testing the fuel pump relay(under the hood) and it tests good. The other mechanic turns it over and it starts...but nobody did anything but jiggle/remove the relay. So to answer your question we are not really sure but it seems to be an electrical connection at the relay.

I don't think the fuel pump really needed to be changed the first time because after the pump was changed there still was no pressure at the fuel rail, which led to finding a defective crankshaft position switch. And now that I think about it, it may not have been necessary if a connection was loose/bad.